Numerical analysis of directional rock blasting using the continuous-discontinuous element method

Numerical analysis of directional rock blasting using the continuous-discontinuous element method

1. numerical methods

   • crack capture
     • Sophisticated methods for quasi-brittle materials
     • examples:
       • remeshing (Areias et al.,2013,2015
       • Embedded cracks/discontinuities(zhang et al.,2015;218;2019)
       • Models enriched with damage/crack degree (zheng and xu, 2014)
   • Advantages and disadvantages of methods
     • efficiency
     • stability
     • complexity
     • versatility

2. keywords

   • Tunnel engineering
   • Numerical simulations
   • Continuous-discontinuous element model

3. reference

   • XU et al.(2022)
   • Other authors mentioned in the document

4. introduction

   • Formation of cracks
     • Cracks around wells
     • Expansion due to explosions

5. Acknowledgments

   • Support from the National Natural Science Foundation of China
   • China's national key research and development projects

6. numerical simulations

   • blasting design
     • explosives and spacing improvement
     • quantification of blasting effects
   • previous research
     • Propagation of stress waves in jointed rocks Jiao et al. (2007
     • 4D-LSM model for stress waves ghu et al.(2018)
     • Dynamic response in concrete slabs zhou et al(2008)

7. Effects of blasting

   • Formation and propagation of cracks
     • initiation from the middle of the well connection line
     • influence of spacing
   • Fracture degree
     • Quantitative evaluation of the effect of blasting

8. Conclusions

   • Summary of findings
     • Continuous-discontinuous element method (CDEM)
     • Cut and split effect
     • Optimal blasting design
   • Recommendations
     • Attention to crushing effects in conventional blasting

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